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                              『News』 valve - control valve to increase the service life of the method


                              Author:SHENGJI        Time:2009-05-07



                                     1. Great work of opening the extension of life expectancy method
                              Regulating valve so that the beginning as far as possible on the maximum aperture, such as 90%. In this way, cavitation, erosion and other damage occurred in the head on the spool. With the valve core damage, increased traffic flow, the corresponding valve clearance a little longer, so continue to disrupt, and gradually shut down, so take full advantage of all of the spool until the spool and the sealing surface root damage, can not be used so far. At the same time, the work of opening big savings gap, and erosion weakened the very beginning than the valve opening in the middle and the small opening on the work life of 1 to 5 times more. Such as a chemical plant using this method, the service life of valve-fold increase of 2.
                                     2. To reduce the work of opening of S increases and increased life expectancy method
                              Reduce S, that is, in addition to increasing the system valve outside losses to the distribution of the valve to reduce the pressure drop, in order to ensure flow through the valve, will inevitably increase the valve opening at the same time, reducing the valve on the pressure drop, so that cavitation, erosion is also reduced. Specific measures are as follows: after the valve pressure drop for plate cutting consumption; the closure of the manual control valves in series on the road to a more ideal valve opening until the work. The beginning of a major election in a small valve opening work, the use of this method is very simple, convenient and effective.
                                    3. Narrow aperture diameter increased to improve the work life of the Law
                              Through the valve to reduce the diameter to increase the opening work, the specific ways: ① replace a file of small-caliber valve, such as DN32 replaced DN25; ② body does not change, the replacement of small diameter spool valve seat Block. Such as a chemical plant overhaul will be replaced by cutting dgl0 items dg8, life expectancy increase by 1 percent.


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